A piece of tonalite on red granite gneiss from Tjörn, SwedenQAPF diagram with tonalite field highlighted
In older references tonalite is sometimes used as a synonym for quartz diorite. However the current IUGSclassification defines tonalite as having greater than 20% quartz, while quartz diorite varies its quartz content from 5 to 20%.[1]
The name is derived from the type locality of tonalites, adjacent to the Tonale Line, a major structural lineament and mountain pass, Tonale Pass, in the Italian and AustrianAlps. The name was first applied by Gerhard vom Rath in 1864.[4] The term adamellite was originally applied by A. Cathrein in 1890 to orthoclase-bearing tonalite (likely a granodiorite) at Monte Adamello, Italy, in 1890, but later came to refer to quartz monzonite, and is now a deprecated term.[5]
^ abLe Bas, M. J.; Streckeisen, A. L. (1991). "The IUGS systematics of igneous rocks". Journal of the Geological Society. 148 (5): 825–833. Bibcode:1991JGSoc.148..825L. CiteSeerX10.1.1.692.4446. doi:10.1144/gsjgs.148.5.0825. S2CID 28548230.
^"Rock Classification Scheme - Vol 1 - Igneous" (PDF). British Geological Survey: Rock Classification Scheme. 1: 1–52. 1999.
^Allaby, Michael (2013). "tonalite". A dictionary of geology and earth sciences (Fourth ed.). Oxford: Oxford University Press. ISBN9780199653065.
^Jackson, Julia A., ed. (1997). "tonalite". Glossary of geology (Fourth ed.). Alexandria, Virginia: American Geological Institute. ISBN0922152349.
^Streckeisen, A. (1 March 1976). "To each plutonic rock its proper name". Earth-Science Reviews. 12 (1): 1–33. doi:10.1016/0012-8252(76)90052-0.
^Castro, Antonio (September 2013). "Tonalite–granodiorite suites as cotectic systems: A review of experimental studies with applications to granitoid petrogenesis". Earth-Science Reviews. 124: 68–95. doi:10.1016/j.earscirev.2013.05.006.
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tonalite, igneous, plutonic, intrusive, rock, felsic, composition, with, phaneritic, coarse, grained, texture, feldspar, present, plagioclase, typically, oligoclase, andesine, with, alkali, feldspar, making, less, than, total, feldspar, content, quartz, sio2, . Tonalite is an igneous plutonic intrusive rock of felsic composition with phaneritic coarse grained texture Feldspar is present as plagioclase typically oligoclase or andesine with alkali feldspar making up less than 10 of the total feldspar content Quartz SiO2 is present as more than 20 of the total quartz alkali feldspar plagioclase feldspathoid QAPF content of the rock 1 2 Amphiboles and biotite are common accessory minerals 3 A piece of tonalite on red granite gneiss from Tjorn SwedenQAPF diagram with tonalite field highlightedIn older references tonalite is sometimes used as a synonym for quartz diorite However the current IUGS classification defines tonalite as having greater than 20 quartz while quartz diorite varies its quartz content from 5 to 20 1 The name is derived from the type locality of tonalites adjacent to the Tonale Line a major structural lineament and mountain pass Tonale Pass in the Italian and Austrian Alps The name was first applied by Gerhard vom Rath in 1864 4 The term adamellite was originally applied by A Cathrein in 1890 to orthoclase bearing tonalite likely a granodiorite at Monte Adamello Italy in 1890 but later came to refer to quartz monzonite and is now a deprecated term 5 Trondhjemite is an orthoclase deficient variety of sodium rich tonalite with minor biotite as the only mafic mineral named after Norway s third largest city Trondheim 6 Tonalites together with granodiorites are characteristic of calc alkaline batholiths formed above subduction zones 7 References edit a b Le Bas M J Streckeisen A L 1991 The IUGS systematics of igneous rocks Journal of the Geological Society 148 5 825 833 Bibcode 1991JGSoc 148 825L CiteSeerX 10 1 1 692 4446 doi 10 1144 gsjgs 148 5 0825 S2CID 28548230 Rock Classification Scheme Vol 1 Igneous PDF British Geological Survey Rock Classification Scheme 1 1 52 1999 Allaby Michael 2013 tonalite A dictionary of geology and earth sciences Fourth ed Oxford Oxford University Press ISBN 9780199653065 Jackson Julia A ed 1997 tonalite Glossary of geology Fourth ed Alexandria Virginia American Geological Institute ISBN 0922152349 Streckeisen A 1 March 1976 To each plutonic rock its proper name Earth Science Reviews 12 1 1 33 doi 10 1016 0012 8252 76 90052 0 Jackson 1997 trondhjemhite Castro Antonio September 2013 Tonalite granodiorite suites as cotectic systems A review of experimental studies with applications to granitoid petrogenesis Earth Science Reviews 124 68 95 doi 10 1016 j earscirev 2013 05 006 External links edit nbsp Media related to Tonalite at Wikimedia Commons nbsp This igneous rock related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Tonalite amp oldid 1178064770, wikipedia, wiki, book, books, library,
